title: Corrosion behavior of tantalum-coated cobalt-chromium modular necks compared to titanium modular necks in a simulator test.
abstract: This study compared the corrosion behavior of tantalum-coated cobalt-chromium modular necks with that of titanium alloy modular necks at their junction to titanium-alloy femoral stem. Tests were performed in a dry assembly and two wet assemblies, one contaminated with calf serum and the other contaminated with calf serum and bone particles. Whereas the titanium modular neck tested in the dry assembly showed no signs of corrosion, the titanium modular necks tested in both wet assemblies showed marked depositions and corrosive attacks. By contrast, the tantalum-coated cobalt-chromium modular necks showed no traces of corrosion or chemical attack in any of the three assemblies. This study confirms the protective effect of tantalum coating the taper region of cobalt-chromium modular neck components, suggesting that the use of tantalum may reduce the risk of implant failure due to corrosion.
authors.affiliation: Orthopaedic University Clinic Salzburg, Muellner Hauptstr. 48, Salzburg, Austria.
authors.forename: Ulrich
authors.initials: U
authors.lastname: Dorn
authors.affiliation: Orthopaedic University Clinic Salzburg, Muellner Hauptstr. 48, Salzburg, Austria.
authors.forename: Daniel
authors.initials: D
authors.lastname: Neumann
authors.affiliation: Intraplant Company, Grenzg. 38a, Mödling, Austria.
authors.forename: Mario
authors.initials: M
authors.lastname: Frank
mesh_terms: D019644:Arthroplasty, Replacement, Hip; D001672:Biocompatible Materials; D001696:Biomechanical Phenomena; D002858:Chromium Alloys; D003343:Corrosion; D006622:Hip Prosthesis; D011474:Prosthesis Design; D011475:Prosthesis Failure; D013314:Stress, Mechanical; D013635:Tantalum; D014025:Titanium
chemical_list: D001672:Biocompatible Materials; D002858:Chromium Alloys; D013635:Tantalum; D014025:Titanium
keywords: corrosion; hip prosthesis; modular neck; modular stem; tantalum coating